Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b38bd5a2f994ce…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 17:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c88547fcf0b2244ecb35f690b1df32d0 SHA-1: cc33e840b2deaec01c5c00ee588f49dff6f3ae59 SHA-256: a5b38bd5a2f994cefd0f76a0114a94e4dd62d0a82998b1062de76b4ced8c3bea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/07554fbe46e378c21152fedb5a932a5a/toviwi.pdf In PDF document text
    • http://gardensyellowcab.com/admin/images/file/vutov.pdfIn PDF document text
    • http://vce34.ru/attachments/file/49868559433.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/veneboferiguxuwirazizo.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/dixuluj.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161360324ee993---26361755881.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jijujawugijibajesumuxi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ecgkgn8gd989cjn0p0nlc4enr9/28123705199.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/meramavitodatuzaxi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4ae3b999---36448354733.pdfIn PDF document text
    • http://minipit.com/data/files/66190557676.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210903225901.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/41718287605.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/73482425656.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/99842967656.pdfIn PDF document text
    • https://simorgh.it/uploads/file/29526403597.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a5b13e18---58426844725.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/rikarirofipo.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/43963484866.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/posufopemefapuzarif.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/giripemi.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/jodeneteju.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131633829ad5---natulelomabesexivo.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/55055222555.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/sunikerezizedudezono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+new+shadow+tolkien+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 21776 bytes
SHA-256: 09ae6ce4b1bdbffe10fe96aba9c493de88589d2fff070cbe9d235e04ddae8694
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 10636 bytes
SHA-256: d097d3d1c5d7e45a80995773938e5093ba13c9c68f53cbb90af5cb753f729739